Change _color_finalizer behavior

[stasfilin]

Issue: #708

Expected Behavior

Tests passing. Ideally, I think --force-color should override NO_COLOR in the containing environment rather than collide with it.

With this modification, if --force-color is provided, it will return True and enforce colors, even if NO_COLOR is set in the environment. If --no-color is provided or NO_COLOR is set in the environment, it will return False and disable colors unless --force-color is also provided.

[stasfilin]

Added a new commit to fix the linter issue

From

if args.nocolor or 'NO_COLOR' in os.environ:

to

if args.nocolor or "NO_COLOR" in os.environ:

[theacodes]

Looks good, thanks!